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This is either bacterial or fungal. Pinning it down will be difficult without testing. You can take samples to your local extension service and they can provide the exact genus and species. The bottom of this articel will take you to a search form to find the closest extension office in your area:

https://www.gardeningknowhow.com/garden-how-to/info/what-is-extension-service.htm

This article will give you more information on fungicide use:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm